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Planned battery storage projects in Washington

Developers have proposed 7 battery storage projects in Washington with 1.7 GW of capacity, in the grid operators' interconnection queues.

  • Planned7

See operating battery storage projects in Washington

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Under 50 MW50–249 MW250 MW and up

Updated monthly. Last updated November 2026.

The largest planned battery storage projects in Washington

Planned, by capacity

#Battery storage projectExpected onlineCapacity
1Hop Hill Solar Generation and BESS2031500 MW
2Lower Snake Solar Generation BESS2029300 MW
3Royal Slope2027260 MW
4Centralia Battery Energy Storage System2028200 MW
5Greenwater BESS2026200 MW
6AGATE BESS2029170 MW
7Arlington Battery Energy Storage System202625 MW

Planned battery storage projects expected online soonest in Washington

In the next 18 months, soonest first

#Battery storage projectExpected onlineCapacity
1Greenwater BESS2026200 MW
2Royal Slope2027260 MW
The developer behind each project is on paid plans. See plans

How Cleanview tracks battery storage projects

Operating battery storage projects come from the EIA's monthly survey of power plants. Planned projects come from the grid operators' interconnection queues. We research who is developing each one, since a queue lists a project company, not its owner.

Questions about battery storage projects in Washington

How many battery storage projects are planned in Washington?
Developers have proposed 7 battery storage projects in Washington with 1.7 GW of capacity, according to the grid operators' interconnection queues. Most queue projects are never built.
What is the largest planned battery storage project in Washington?
Hop Hill Solar Generation and BESS in Benton County, Washington is the largest planned, at 500 MW. It is expected to come online in 2031.
Who is developing battery storage projects in Washington?
Interconnection queues list each project under a project company, not the developer behind it. Cleanview researches the developer of every project and has them on paid plans.

More energy trackers for Washington

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